Quick answers
- Which hospitals does John D. Ayers work at?
- Medicare's official clinician data lists John D. Ayers at 4 hospitals: Northwestern Medicine Central Dupage Hospital, Northwestern Medicine Delnor Community Hospital, Northwestern Medicine Kishwaukee Hospital and Northwestern Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John D. Ayers see patients?
- Medicare's clinician data lists 2 practice locations, including Warrenville, IL. Call before your visit to confirm the address.
- What is John D. Ayers's specialty?
- Medicare lists Hematology/Oncology as the primary specialty, and also Internal Medicine.
- Does John D. Ayers accept Medicare assignment?
- Yes. Medicare's clinician data says John D. Ayers accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John D. Ayers offer telehealth?
- Medicare's clinician data says John D. Ayers offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John D. Ayers?
- (630) 352-5580, as listed in official Medicare / NPI Registry data.
- What is John D. Ayers's NPI number?
- 1477540821. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John D. Ayers works
Medicare's Facility Affiliation Data lists John D. Ayers at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · CCN 140211
- Northwestern Medicine Kishwaukee HospitalDekalb, IL · Acute Care Hospital · CCN 140286
- Northwestern Memorial HospitalChicago, IL · Acute Care Hospital · CCN 140281
Practice locations
Addresses where John D. Ayers is enrolled with Medicare (CMS data updated 2026-10-02).
- 4405 Weaver PkwyWarrenville, IL 60555 (630) 352‑5580
- 4405 Weaver PwkyWarrenville, IL 60555 (630) 352‑5352
Group practices
Medicare enrollment lists John D. Ayers as a member of these groups (CMS data updated 2026-10-02).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
- Central Dupage Physician Group1,080 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Internal Medicinealso
Other hematologist-oncologists in Warrenville
Clinicians with the same Medicare primary specialty in Warrenville, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1477540821 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians